| (19) |
 |
|
(11) |
EP 0 999 207 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
|
24.05.2000 Bulletin 2000/21 |
| (43) |
Date of publication A2: |
|
10.05.2000 Bulletin 2000/19 |
| (22) |
Date of filing: 04.10.1999 |
|
|
| (84) |
Designated Contracting States: |
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AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE |
|
Designated Extension States: |
|
AL LT LV MK RO SI |
| (30) |
Priority: |
05.11.1998 US 186579
|
| (71) |
Applicant: NALCO/EXXON ENERGY CHEMICALS L.P. |
|
Sugarland, Texas 77478 (US) |
|
| (72) |
Inventors: |
|
- Patel, Natu R.
Houston, Texas 77043 (US)
- Lewis, Vincent E.
Missouri City, Texas 77459 (US)
- Enderson, Margaret D.
Sugar Land, Texas 77478 (US)
|
| (74) |
Representative: Harrison, David Christopher et al |
|
MEWBURN ELLIS York House 23 Kingsway
London WC2B 6HP
London WC2B 6HP (GB) |
|
| |
|
| (54) |
Method for removal of aldehydes from chemical manufacturing production streams during
distillative purification |
(57) A method for improving purification efficiency when distilling off aldehyde contaminants
during chemical manufacturing processes by adding a substituted aromatic amine having
electron donating group substituents prior to the distillation column. The method
is particularly useful for removal of aldehydes such as acrolein, generated as a by-product
of acrylonitrile manufacture. Preferred aromatic amines are 2-amino aniline, 3,4-dimethyl
aniline and 4-ethyl aniline.